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Finding the Fourth Proportional to 66.27, 98.91 and 57.56

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Solution

The fourth proportional to 66.27, 98.91 and 57.56 is: 85.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.27 : 98.91 = 57.56 : x
  2. Step 2: Convert to fraction form
    66.27/98.91 = 57.56/x
  3. Step 3: Cross multiply
    66.27x = 98.91 × 57.56
  4. Step 4: Simplify right side
    66.27x = 5,692.77
  5. Step 5: Solve for x
    x = 5,692.77/66.27
  6. Step 6: Final answer
    x = 85.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.